turn off let floating
dsabel at stud.uni-frankfurt.de
Fri Apr 9 16:27:01 EDT 2004
you can turn off let-floating by compiling without optimizations,
i.e. without using a -O flag or using -O0 explicitly.
The disadvantage is that most of all other optimizations
are turned off too.
Another possibility would be to compile your program with HasFuse
which is a modification of GHC, that performs only such transformations
that are compatible with the use of unsafePerformIO.
(no common subexpression elimination,
no let-floating out,
more restrictive inlining)
In fact, HasFuse guarantees more than compiling SAFE uses of
unsafePerformIO correctly (it fulfills the FUNDIO-semantics),
but HasFuse can also be used to compile 'normal' Haskell programs.
JWGU Frankfurt, Germany
----- Original Message -----
From: "Bernard James POPE" <bjpop at cs.mu.OZ.AU>
To: <glasgow-haskell-users at haskell.org>
Cc: "Bernard James POPE" <bjpop at cs.mu.OZ.AU>
Sent: Tuesday, April 06, 2004 10:24 AM
Subject: turn off let floating
> Hi all,
> In the documentation for System.IO.Unsafe
> it says:
> Make sure that the either you switch off let-floating,
> or that the call to unsafePerformIO cannot float outside a lambda.
> My question is how can you turn off let floating? I can't seem to
> find a flag that suggests this behaviour.
> Glasgow-haskell-users mailing list
> Glasgow-haskell-users at haskell.org
More information about the Glasgow-haskell-users